Does it reach the normal cut-off pressure (110-120 psi). If it does then the relief valve must be cutting in to protect the receiver and you need to replace the cut-out switch. If the pressure does not reach the cut-out pressure then:- a. the relief valve is leaking . b. there is a leak in the system somewhere, use soapy water and paint brush to look for leaks. c. the compressor has lost efficiency and needs at least new rings.

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Related Questions:

Looks like it's an oiled style compressor. Is it getting pretty hot by the time it hits 60psi? Might be low on oil, or the oil has been contaminated with water from condensation. If that's the case then what is happening is the compressor is causing too much resistance for the motor to turn it because of the excess friction. This is could be what is causing it to shut down prematurely.

It's on the bottom, right hand side of the tank if you are facing the tank side. You can download the owners manual from this link. It is at the upper right side of the page in the section marked downloads.

I believe that you have a very simple problem related to the in-tank check valve. Follow the discharge hose from the compressor to the tank. It should connect to a brass or chrome valve. This valve has a one way check valve that allows air into tank and not return to compressor (if air leaks back, compressor will be under load (motor will not overcome) and air will leak from the pressure switch unloader valve). With air in the tank, remove the hose at the check valve and spray soapy water to verify leak, replace part or clean as needed. Good luck

Your concern is very well placed, at pressures that high a lot of damage can be caused by a failure. According to the manual for this model air compressor the approximate cut-in pressure is 160 psi and the approximate cut-out pressure is 200 psi. Meaning it should pump up to 'about' 200 psi and shut off and not come on again until it gets down to 'about' 160 psi. They say approximate and I say about because it's not an exact science setting the pressure switch. Spring rates are not always exact, pressure guages are not that precise, etc. When turned on, it should shut off at 200 psi +/- 10 lbs. If it goes more than 10 lbs over that (220psi), I'd recommend you get the pressure switch and or guages checked or replaced.